package com.atguigu.flink.chapter11;

import com.atguigu.flink.bean.WaterSensor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.types.Row;

import static org.apache.flink.table.api.Expressions.$;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/12/21 10:04
 */
public class Flink01_Table_BaseUse {
    public static void main(String[] args) {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 20000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
    
        DataStreamSource<WaterSensor> waterSensorStream =
            env.fromElements(new WaterSensor("sensor_1", 1000L, 10),
                             new WaterSensor("sensor_1", 2000L, 20),
                             new WaterSensor("sensor_2", 3000L, 30),
                             new WaterSensor("sensor_1", 4000L, 40),
                             new WaterSensor("sensor_1", 5000L, 50),
                             new WaterSensor("sensor_2", 6000L, 60));
        
        
        // 1. 获取一个表的环境
        StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);
        // 2. 把流转成一个动态表 表的列名默认就是属性名
        Table table = tEnv.fromDataStream(waterSensorStream);
        // 3. 在动态表上执行连续查询, 得到一个新的动态表  select .. from t where id=''
        
        /*Table result = table
            .where("id='sensor_1'")
            .select("id,vc");*/
        Table result = table
            .where($("id").isEqual("sensor_1"))
            .select($("id"), $("vc"));
    
        // 4. 把新的动态表转成流, 打印
        DataStream<Row> stream = tEnv.toAppendStream(result, Row.class);
        stream.print();
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
        
    }
}
